Update DAVx⁵ to 3.4-ose (304000003)

metadata/at.bitfire.davdroid.yml

@@ -1483,7 +1483,19 @@ Builds:
         build.gradle
       - sed -i -e '/flexbox-layout/d' ../build.gradle
 
+  - versionName: 3.4-ose
+    versionCode: 304000003
+    commit: d8a70ca30cc337ce2c03d7140c23d002eb1a875d
+    subdir: app
+    submodules: true
+    gradle:
+      - standard
+    prebuild:
+      - sed -i -e 's/com.google.android:flexbox/com.github.google:flexbox-layout/'
+        build.gradle
+      - sed -i -e '/flexbox-layout/d' ../build.gradle
+
 AutoUpdateMode: Version v%v
 UpdateCheckMode: Tags ^v[0-9.]+-ose[0-9]*$
-CurrentVersion: 3.3.12-ose
-CurrentVersionCode: 303120005
+CurrentVersion: 3.4-ose
+CurrentVersionCode: 304000003